What does this sign mean?

What does this sign mean?undefined
The width of the road is 4.65m
The turning circle is 4.65m
The maximum safe length of a vehicle is 4.65m
The maximum safe height of a vehicle is 4.65m

This sign applies to all vehicles, as it is a height warning and indicates the height restriction applicable to the road ahead, as shown by the upward-pointing triangle on the sign. All vehicles must be mindful of their height, as any trailers they may be towing could exceed the height limit.